基于FPGA与DSP架构的航空相机主控设计

Design of aerial camera controller based on FPGA and DSP architecture

针对航空相机主控对功能,性能,接口需求日益复杂的问题,提出了基于现场可编程逻辑门陈列(FPGA)与数字信号处理器(DSP)联合架构的解决方案。FPGA模块负责实现系统内部多路RS422通信接口扩展,DSP模块完成主控系统的整体时序控制、逻辑控制与参数计算,DSP与FPGA的采用共享内存的方式完成数据交互,实验表明,在通信周期为20ms、系统时钟为29.491 2MHz的条件下,主控系统能够稳定的在波特率为460 800B/s时完成与分系统间的数据交互,本方案兼具了DSP的数据处理能力和FPGA的逻辑控制能力,充分的发挥二者的优点,具有良好的项目适用性与可扩展性。

In order to the increasingly complex functions,performance and interface requirements of aerial camera main controller,a solution based on FPGA and DSP joint architecture was proposed in this paper.The FPGA module is responsible for realizing the multi-channel RS422 communication interface extension within the system.The DSP module completes the overall timing control,logic control and parameter calculation of the main controller.DSP and FPGA both takes the sharing memory way with the help of data interaction.The experimental results show that in the communication cycle of 20 ms,under the condition of the system clock is 29.491 2 MHz,main controller can be stable for the subsystem of data exchanging in the baud rate for 460 800 B/s.This scheme takes note of DSP data processing capability and FPGA logic control ability,fully takes the advantages of both,with good applicability and scalability.